PROLOGThis manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
NAMEsched.h --- execution scheduling
DESCRIPTIONThe <sched.h> header shall define the pid_t type as described in <sys/types.h>. The <sched.h> header shall define the time_t type as described in <sys/types.h>. The <sched.h> header shall define the timespec structure as described in <time.h>. The <sched.h> header shall define the sched_param structure, which shall include the scheduling parameters required for implementation of each supported scheduling policy. This structure shall include at least the following member:
int sched_priority Process or thread execution scheduling priority.
int sched_ss_low_priority Low scheduling priority for sporadic server. struct timespec sched_ss_repl_period Replenishment period for sporadic server. struct timespec sched_ss_init_budget Initial budget for sporadic server. int sched_ss_max_repl Maximum pending replenishments for sporadic server.
- First in-first out (FIFO) scheduling policy.
- Round robin scheduling policy.
- Sporadic server scheduling policy.
Another scheduling policy.
The values of these constants are distinct.
The following shall be declared as functions and may also be defined
as macros. Function prototypes shall be provided.
int sched_get_priority_max(int); int sched_get_priority_min(int); int sched_getparam(pid_t, struct sched_param *); int sched_getscheduler(pid_t); int sched_rr_get_interval(pid_t, struct timespec *); int sched_setparam(pid_t, const struct sched_param *); int sched_setscheduler(pid_t, int, const struct sched_param *); int sched_yield(void);
The following sections are informative.
SEE ALSO<sys_types.h>, <time.h> The System Interfaces volume of POSIX.1-2008, sched_get_priority_max(), sched_getparam(), sched_getscheduler(), sched_rr_get_interval(), sched_setparam(), sched_setscheduler(), sched_yield()
COPYRIGHTPortions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at www.unix.org/online.html .
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